脉冲爆震发动机高温压力测量方法

Pressure measurement method under high temperature for pulse detonation engine

关键词:  脉冲爆震发动机  离子电流  高温压力测量  离子探针

Key words:  Pulse detonation engine  Ion current  High-temperature-pressure measurement  Ion probe

摘要:

为寻找一种适合于脉冲爆震发动机高温环境下的压力测量方法,在基于离子电流的PDE高温压力传感器机理研究的基础上,推导获得离子电流衰减速度与爆震波压力峰值的关系。设计了一种新型的单短探针型离子传感器,开展了单爆震试验获得了大量实验数据,采用最小二乘算法对试验数据拟合,获得了两者关系的具体表达式。研究结果表明,通过离子电流衰减速度计算获得的压力峰值与标定压力传感器测量值基本一致,误差在3%以内。

Abstract:

In order to develop a new pressure-measurement method adaptive to the high temperature environment in pulse detonation engine(PDE),the relationship between ion current decay rate and the pressure peak of detonation wave is derived based on the theoretical analysis.A new type of short ion probe with single pole is designed.The least-square algorithm is employed to fit the data obtained in single-detonation experiments.The mathematical model of relationship between ion current decay rate and the pressure peak of detonation wave is obtained.The satisfactory results demonstrate that calculations using the ion current decay rate were consistent with measurements of the pressure sensors,and its relative error is less than 3%.